alamb commented on issue #9059:
URL: https://github.com/apache/arrow-rs/issues/9059#issuecomment-3730785811

   I think we could probably sprinkly some "reserves" in there locally, but I 
think we can probably do much better if we reserve the correct capacity when 
creating the output buffers in the first place (as we know the (max) output 
size = `batch_size`)
   
   i have some ideas on how to wire this in. 


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